Gallery Proving that HBN Works – Limited Copper Buildup after 50 shots – 375 CheyTac. No Copper Fowling – 50 shots – 375 CheyTac No Copper Fowling – Cleaning after 50 shots – 375 CheyTac Proving that HBN Works – Limited Copper Buildup after 19 shots – 6.5 x 47 Lapua. Barrel – 19 shots – 6.5 x 47 Lapua 1 Barrel – 19 shots – 6.5 x 47 Lapua 2 Expansion Test performed by shooting Balistix .375″ Ultra Hunt 250gr bullets into pottery clay. Balistix .375 250gr Ultra Hunt – Expansion Test 3 Balistix .375 250gr Ultra Hunt – Expansion Test 4 Balistix .375 250gr Ultra Hunt – Expansion Test 1 Balistix .375 250gr Ultra Hunt – Expansion Test 2 Balistix .375 250gr Ultra Hunt – Pottery Clay 1